my %hash=();
my $highest;
my @highest=grep {defined $highest ? $hash{$_}==$highest : (($highest=
+$hash{$_}),1) }
sort { $hash{$b} <=> $hash{$a} || $a cmp $b }
keys %hash;
or
my %hash=();
my %rev;
my $highest=0;
for (keys %hash) {
$rev{$hash{$_}}{$_}++;
$highest=$hash{$_} if $highest < $hash{$_};
}
print sort keys %{$rev{$highest}};
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